The cervix is part of a woman's reproductive system. It's in the pelvis. The cervix is the lower, narrow part of the uterus (womb).

The cervix is a passageway:

• The cervix connects the uterus to the vagina. During a menstrual period, blood flows from the uterus through the cervix into the vagina. The vagina leads to the outside of the body.
  
  
• The cervix makes mucus. During sex, mucus helps sperm move from the vagina through the cervix into the uterus.
  
  
• During pregnancy, the cervix is tightly closed to help keep the baby inside the uterus. During childbirth, the cervix opens to allow the baby to pass through the vagina.

This picture shows the cervix and nearby organs.

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